Optika Atmosfery i Okeana Journal

Vol. 36, issue 07, article # 9

Simonova G. V., Kalashnikova D. A., Markelova A. N., Bondarenko A. S., Davydkina A. E. Variations in the oxygen and hydrogen isotope composition of precipitation in Tomsk (2016–2020). // Optika Atmosfery i Okeana. 2023. V. 36. No. 07. P. 595–601. DOI: 10.15372/AOO20230709 [in Russian].
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Abstract:

Changes in the oxygen (δ¹⁸O) and hydrogen (δD) isotope compositions of precipitation in Tomsk in the period from 2016 to 2020 are studied. It is found that the δ¹⁸O value varies in the range from -39.6 to +2.1‰, the average value over the entire period is -18±6.8‰; the δD value varies in the range from -299 to -4.9‰, the average value is -118.7±54.7‰. A Local Meteoric Water Line is calculated for the period from 2016 to 2020: δD = 7.43δ¹⁸O + 11.2; this equation indicates the predominance of evaporative fractionation. The dependence of the isotope composition of precipitation on temperature in Tomsk is derived: +0.47‰/°C for the δ¹⁸O value and +3.62‰/°C for the δD value. The main regions that provide atmospheric precipitation with different isotope compositions to Tomsk are identified based on the analysis of the airmass backward trajectories.

Keywords:

precipitation, hydrogen and oxygen stable isotopes, dD, d18O

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